How would I delete all lines (from a text file) which contain only two dots, with random data between the dots. Some lines have three or more dots, and I need those to remain in the file. I would like to use sed.
Example Dirty File:
.dirty.dig
.please.dont.delete.me
.delete.me
.dont.delete.me.ether
.nnoooo.not.meee
.needto.delete
Desired Output:
.please.dont.delete.me
.dont.delete.me.ether
.nnoooo.not.meee